# Need help with using the reference implementation library

**Category:** [Reference Implementation: Java (archive)](https://discourse.openehr.org/c/reference-implementation-java-archive/154)
**Created:** 2013-03-23 11:30 UTC
**Views:** 7
**Replies:** 1
**URL:** https://discourse.openehr.org/t/need-help-with-using-the-reference-implementation-library/13362

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## Post #1 by @Kumar_Saurabh

Hi,

I am a student trying to use OpenEHR reference implementation\. I downloaded the jars and
was able to use it to parse an ADL file and get the AOM\. But i am not able to find the
correct way of acessing the AOM \(Archetype object\) to find the leaf nodes\. I could get
to the definition and the children at the fist level but beyond that i was not able to
do anything\. I am just trying to create a simple UI for a very simple observation model
\(only body temperature\) by parsing an ADL\. But i am struggling to find a correct way of
doing it\. I am not able to locate useful documentation either\.

Can somebody please help?

Thanks and Regards,
Saurabh

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## Post #2 by @gerardo.iago.corbal

Hi Saurabh,
you can iterate through each one of the paths and filter what you need:

        Map<String, CObject> pathObjectMap = ar\.getPathNodeMap\(\);
        ArrayList<String> paths = new ArrayList<String>\(pathObjectMap\.keySet\(\)\);
        //Sort paths\. Shortest path first \(to access clusters before children\)
        Collections\.sort\(paths\);
        for \(String path : paths\) \{
            CObject cObject = pathObjectMap\.get\(path\);
           //manage cObject
        \}

In the GDL project you have a full example:
https://github.com/openEHR/gdl-tools/blob/master/cds/cds-openehr/src/main/java/se/cambio/cds/openehr/model/facade/archetype/plain/PlainArchetypeFacadeDelegate.java
\(loadArchetypeObjects method\)

Cheers,

iago

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**Canonical:** https://discourse.openehr.org/t/need-help-with-using-the-reference-implementation-library/13362
**Original content:** https://discourse.openehr.org/t/need-help-with-using-the-reference-implementation-library/13362